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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c5f4a933323c2a5ff9e1ece2338210070c43cfbf01d78e5cadba266a1be8c0' 
  AND token = 'mk9miBOAFYlcjsEFdDrEdXZ5zuVg4DveODGWsssv4uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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