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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024c53258a0f987ec6356dac7a600a2e64edbae39d275867405c7a44c4cab97d' 
  AND token = 'UXp1FakiT8ov8T2I3SUVPsVWkPB846n5IWRQ4MzrtX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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