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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabc589312bdd45053b04ce8672bca6a0ba1b81bf43e7a054563eaf479f4acba' 
  AND token = 'FdSqK4//38UciWwyZLQFPubEiT4jQgIJOQQdcO8IhJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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