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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93955fa9451a702648cd9d54c2ea0ed92cde6db87f535549eb9ad3e496a2b00' 
  AND token = 'pS3Edd/6AA0U/qFLLPQnNtOl+abQB86cZ3j87CvgtQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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