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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9892f2c9c24e6d16d7951938d660fc15393df508546b3a1add12fda5bf172960' 
  AND token = '3dAgn5bWmrmLQbsCMhwPQ55n/4PAlmUk3xb8Cayt7mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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