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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6fd2e6e8cc006ee9d3e29c47927453357dfde8d2a5932556a64b3f8abce15f' 
  AND token = '9E8kf/exqyq3tteEV2nsb6OpK/dq82adq/YMppPoMF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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