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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d16c4642016ecfeb6e717b71d4c7fed5ba205da43db7bbfd2b80ccf3c6b891' 
  AND token = '4Ais/mXxnaWAkWV6MFpgk8Bm96s/S1JokAUGfmtnLNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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