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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f28a3724eb1d2190b0595113ce0d0277ef6a999cda6df2f5b545a24ea639521' 
  AND token = '9qb7zEbmdj6CHY6bZbiHOR/Ht3fxYhT7oMGMB4z29fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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