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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ae6c5a6e66ec12eaff7a195e1fd211ef95246f09a76188677c408407272307' 
  AND token = 'WOaP2/bE/Z5ESUvK/LrozNADteBpSCDssECYTN/IHl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}