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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f3c9b56b0bfa0f991c63f8baa8393801c0a45bb88df4a4954699e9ef57a568' 
  AND token = '0yCZAHyvDa6XvAaAtod0YhoH7Lgzc5M5YsVgFo34CSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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