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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb5bac41c3262634c5a7a1d5fb0aa34ad6f5742e2470cbb6f1dd4d903ce21f3' 
  AND token = 'RKrWhNY71EtjE+2V8fw5NjfVI65ya3u/aMfSTD9pkeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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