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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa1edf9f20bfab8cbc36ef7597675314e6ff08ee6711fc42600f8c04fc115b4' 
  AND token = '3hkjrl4ZJeF2Z/HcDlLt2EzH9/NZ0efvpEqcRJZJYbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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