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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2584984dfe7e3584c51f9a571bf7db2b4e3ab29d03f32acd6c081d47ecf6487' 
  AND token = 'AlHD2kZUaQAfZrmj9nM0aYX9Br4VRjg8FYGWxfpsT0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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