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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea32a115c98c93655072ff34ce5b41641556af6a684bacccfe30c6bffc10629' 
  AND token = '6YgJs0uQ8hKAjuz63kzvQHbpi1+LmCuDqCaNjowklNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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