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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd7ad5184d067a658537c048954b17a9cbaae57cd05bc0d5eba36a6039446b6' 
  AND token = 'i2OC0fLay0K0/CoP4aE7vF2q8Z9CNcfdeKfxWstsqN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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