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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9280d9dd21811a66aa8d567b495cc0624c0aad360ba6f77a6bb71be4122b8d' 
  AND token = '0VXooz76e/lm4NVuBRxAUGmiFpMaWap4tmqlmDYvE1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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