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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd16e0d063e8df5f4d6f25c8a9a9aa98a11a2a91f258f37ca4b7f37c82b00b9' 
  AND token = 'kA2aKC38PeJ67b3V1dkTM+NcAvtuR9h3daeFk2Dhflg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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