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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dba3a1dfcf5a5d432bad237fab9278b80992c514c6565c764d482934b2aa70e' 
  AND token = 'r+K+tOq0ENaDlI8b1z+H5zJgmbyRfl+xGNzf/YiM4I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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