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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58be74a5589f105163ebeda4df036b6117c243b299efc8a06356778781ece7ef' 
  AND token = 'srzEMC2FJMVn+rc35gmcNd1sUaOAG5SC/ulKNXw1FYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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