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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c126eebc85cdc03baefa6579bfc8d1d925cecf5ceca54fc0ed4d02f2e274fb3b' 
  AND token = 'Rovob8/QjUERno7fGeCuSDpf/VegKbQOS4A74KEQPzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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