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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f91730b245b4c275d1c68bf08e25fe56804f661b822c9ec34ad4656fcec4ee7' 
  AND token = 'k6FMVmRhOQtm0/p12q+YeD7ipqj9FDLFySD+bLb+FJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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