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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3795a3c8539f49c0b687a533f3757084f1f39df26e3147af7897ec5743497c2f' 
  AND token = 'e2iClFDbpEWS5cn+PhNIZZjv7y+S4/fyWwsAurC3cHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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