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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2e94989ecbde0735090e62b9d095ea49d3142ab2b21dde62b3e42994ed5bf8' 
  AND token = 'oe3ljoV1Hc9/t/kabeeEEhJifuywu3il7KDedvz/n2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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