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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650cadead07971466b9ecb61e2a4a58ea8795d2cf7e32fe8b92211abc1babe35' 
  AND token = 'kdlBHqPZL1Med4XMyhMZez+P5RycxdG9u2qU+QLwZ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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