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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4182a212eaa5a157cffa4b8f2ea38dc0d32f79a4043aa306e65c40481c6d5192' 
  AND token = 'J03+QoqD8c9gcT6/Bv9M3cm03fhsbX08p10r5S/2DQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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