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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcaf1aa352c130a30660c3d908735ebaa2b3a618d4b743f4b5fdcb54a9e489f' 
  AND token = 'ocjAZ1KYi4PDcJy283yGHIVQuObACppGk0ygHNpF1AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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