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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ff62b87ccacca75c9ca30820e6f63a8a9037ff4a0a8ee704766fe459b813ac' 
  AND token = 'dXiCtCiXPh3u9ER416ZWk6ingQK9Iqmm9PSrAgPwRxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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