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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3217e127a70276fa51fe314d78ec4e1a74e6c6772e55023eb8e5d0a4cacf6fbf' 
  AND token = 'hodPXRFR3TQXNHv+fpt3PYU3ZcYoW7aqZBgq24qHZ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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