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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7937010899eccda336370cb84623f68c983233b3619aca0a68c036209c58a824' 
  AND token = 'mHH4rCdCMoorpx6qIe3zy1Yda15b1NFTzlIc9byZKso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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