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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672d7f6aa04624a20041e231fd85e103c0ce1f4a48c662ddf3413430dcbd1227' 
  AND token = 'XZ76ht3kmu/w9mM8BMQ0c9ut9FU+MO9Yvi7fw6Kkk2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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