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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2b01bc63ae6634dba7cf53e1432a3489657976dd685c6a2bc9b1d0889729bb' 
  AND token = 'aDkutCY7CNIs8fcBGV9PFY1Urv2tRO9H5GQpP+3veXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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