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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2762487311f827c5de96a23dd047602d931ae520e5162dddc36e8963971bc889' 
  AND token = '8rV4s9VWu7Gs8NFbpmi9x9TmlG6IFaWGnswql27oT4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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