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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3809884e9c5ed26cd8aacc4760c6799252afdb6acb91508982a96b872afbc50b' 
  AND token = 'rHwyBIOI07qrs1hDjn1azim8pQpFJjWCC6FAvRiu3n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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