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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6d9f6bde80ac7efd94c01b863515f215ae17930e05a3dfcf4e771278d77af2' 
  AND token = 'fLHYAoj4a3vlBt5JKptVfG9oxb63lC7w72mI+JHwvUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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