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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f94ad769cda1a66e424d8e8570a4f9658af4a0fbfc732d5b51624aacba91e69' 
  AND token = 'x+KaOmKAdxOgLAWRZYySwZ6KDXqgVeQByWTrt6jokyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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