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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03792bd24404825319c33c45253ae02d6744bb2e6e5a78f3b3e2782188c696d5' 
  AND token = 'qdWxHfQ2IjezeKaJ0VN95ZCBVOSRF6/BtWfmOO1tBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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