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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9041145efe060dd9a78062adf20ae3bc5de22ad557ea6d1c124ef7dc4becfc6' 
  AND token = '9fQGgCwtIzfiu6sVUKpi8ROiPXVMsNweOQCe7yIn9zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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