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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6316ba555e7f03e041c87185915e92a734eded33c35574ef0f069c62d37b4f9b' 
  AND token = 'hksKVc0E8Odzu840Q30y7ZlbAtzaSLtECwdSaa6bTGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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