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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1328747569255a58cbcfc96ac19fef89061cfc6d0c3fd2e3f55164289f4985' 
  AND token = '7Lqg4tm9fCUfd6mI3rOL93H6mage/MU4fjE47PTSq6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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