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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8297f6af5b88aa753ba77113e191763ffa2ff4d32819ac4fd154ad2fa15466b9' 
  AND token = 'WX7d4eSeWevOf/SbNAoJ5g0mC1UyAqJfz8/8/W83oL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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