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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd387a34adbddee1602c0c403e7ccede573f302d8c73216c9ce7a8ad4f7ef6ea9' 
  AND token = 'n69x9rIJLkQfADgjkDcoEunN7KZiaQ3yRy923Tc80aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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