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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffc68cc32b42498e17304d708ecb2836aaa36742cc18d63fc7974c8587847e2' 
  AND token = 't9JmPAV7RhXjNBxT/oIqrLTgR7Rns1+upSoEwRSQx5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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