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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2bf52c7f972db31d8d6817cf2b08333f2cbf0930977568a7676a4328eebe85' 
  AND token = 'YE80rAY6hSCb9zchVnPk3rdfs0UR0aDyVi3UDOqtg70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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