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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a9a175891e7cf0e980e72b0a0a4f9e199fc57cbeeefa62cdffbf24b62f3041' 
  AND token = 'KEYItT0TS3fvOLkYUS3+2bR/Aac2wWLTZRbMowuyqZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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