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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695562d9b8550795fa36bf45947e96bd5f9af31b3d37ffe5a13513c357277f06' 
  AND token = 'CvgnJfteXsQAXVfI4RNUd3NyII8G/O3ljR0Zyv/dbvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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