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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ad829cd68ca8d8ee14fd729dd8151254e0ca75e1d845e9e46c968fc693c9be' 
  AND token = 'n62vQN7y6BsaDvp7ryEjHqNbgVm3q2cw8GlEfKl6bJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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