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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9586d2c39ed2ca4039ad33fedc8fd3605f59a16d9b9e9b5ad3b6abbab84e5847' 
  AND token = 'UzMzziWbCXmzCI4w5ya3P2Y2bojBsxLFGhHVLkC4Cio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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