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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70193bf50362027d7e33caa2df94fa2a1d59f429b7b37050b979f39e4d16c9b0' 
  AND token = 'gV5maS9ceeN5J5CcPDJKU+t2Fsqr1s7mDmDvi5WctLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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