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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c800cab2233c577392d58a83ad75906eb49f15bab5889014df7ae6195cee23' 
  AND token = 'g9U829zFbf15h8sStmcBnfBMXumbM8eOc67r8g2DQro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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