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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4fc98a3a08cd1ec1149dc3c46f0af1640a7ad0c9e9c9ba73060483a43fecc7' 
  AND token = 'iOTYLzLGAxZOruhAfG1WeiDBL1YtEqXhxepsuqoaH2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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