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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c825093c99d16e3bac75e192723f557239e53545c899d484e19a611fb3ce73c' 
  AND token = 'Phjz33gS7iient4wBJvbS3pcytaDjpJ6x609SU56oEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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