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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4585c88f8daa1250b2caa20b94b9f71d3464019965ccdbd8bc5bda0a97168e9' 
  AND token = 'wQGOMYLhyJLteaYrO0btE17Y4VlHahsx2+KNtg0CuDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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