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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8194c2c8db697b07706deb7e51736df8075c3e682ae0451e00874290baad94' 
  AND token = 'tMjH2Q4Spx7sbaGRwEJ3yQnzoIIj2Hl3HT2+cM1FPz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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