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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd237658ee11f2dbe60ff04e0e0566dbcabc8aa4bb9f3a3dfb01a27142694f562' 
  AND token = 'NXd2pI+mprc1eIGxRTJsAL8SHG+izKpjfg76jGB9+Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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