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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7534f3dd4b295f6323402e95a54721f4071f79bbe55ab19c66c449bc08a5190e' 
  AND token = 'dO72n1IfiAKJjAqS7/UxrB0O8gXebJ5K90uVf9mL50Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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