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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd55316a737f3896cb7e1227bdea9e511b6a0d1a03f1b30e59437f4eeeb90b7' 
  AND token = 'iECxcP6pjjK1thlpeG3L0XAJ+hHcfXPUlQGRfVlLTjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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