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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fbcb5e26b82972d89b8e56fcd7da74fe005323e66bcbd0ed5959ce1252c0be' 
  AND token = 'QwzyddgXi+py2g+fE3Wdr/3jq/hX11fnXgx7xx+Fdsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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