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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5697b1a2260d461ba44e84a398a9bbfac0d5a0d7f7ebac84036b179df5416496' 
  AND token = 'MF4jLJeBAsoVyO1bsuiMQahdw5FrC3eISUSzjwU0mWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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