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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429669a9add240efaed12a68f00f7185bdaf5f43eb2421946f9ef56d05043624' 
  AND token = 'V+zSeI6i/O5+yZkQEKk0VXO+NLXwgxsDx3Fd4TloUSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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