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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfc01161a62d1b05d40bb787d30c83b450be7e3338dce0c551f37047167b0e5' 
  AND token = '/NATnMuYm5hLYl8KF3iEPdy7phdnkjsHcG8QRfNGmM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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