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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6c99752df0ea4c43ae7c00599b0384008ac46425465a520f1db0f259e11798' 
  AND token = 'M9Axkxj31OWbGqo+nfwEBHybVJ1NDsvOKqUOv23vP4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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