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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c939ded8d496a66ee6d8b82eb6ee05a2b19935526527dc9d9c96934d7210118' 
  AND token = 'FEubL6YVDIh/KF9plwKTudtO1VUfKCfFQScKFlmQg+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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